Holding(s) in Company

15th Feb 2007 11:34

TR-1: NOTIFICATION OF MAJOR INTERESTS IN SHARES

1. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached:

COOKSON GROUP PLC

2. Reason for the notification (please state Yes/No):

An acquisition or disposal of voting rights: ( )

An acquisition or disposal of financial instruments which may result in the acquisition of shares already issued to which voting rights are attached: ( )

An event changing the breakdown of voting rights: ( )

Other (please specify) : ( Yes: See additional information )

3. Full name of person(s) subject to the notification obligation:

LEGAL & GENERAL GROUP PLC (L&G)

4. Full name of shareholder(s) (if different from 3.):

LEGAL & GENERAL ASSUSRANCE (PENSIONS MANAGEMENT) LIMITED (PCM)

5. Date of the transaction (and date on which the threshold is crossed or reached if different):

N/A

6. Date on which issuer notified:

14 FEBRUARY 2007

7. Threshold(s) that is/are crossed or reached:

ABOVE 3% (L&G) 8. Notified details:¢â‚¬¦¢â‚¬¦¢â‚¬¦¢â‚¬¦¢â‚¬¦..

A: Voting rights attached to shares

Class/type of shares if possible Situation previous to the using the ISIN CODE Triggering transaction Number of Number of voting shares Rights ORD GBP 0.10 57,051,207 3.01% (under S-198 on 02/02/2004)

Resulting situation after the triggering transaction

Class/type of shares if possible using Number of Number of voting % of voting the ISIN CODE shares rights rights Direct Direct Indirect Direct Indirect ORD GBP 0.10 6,752,034 6,752,034 3.49 B: Financial Instruments

Resulting situation after the triggering transaction

Type of Expiration Exercise/ Number of voting rights that may be % of financial Date Conversion acquired if the instrument is voting instrument Period/ Date exercised/ converted. rights N/A Total (A+B)Number of voting % of voting rights rights 6,752,034 3.49

9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held, if applicable:

Legal & General Group plc (Direct and Indirect) (Group) Legal & General Investment Management (Holdings) Limited (LGIMH) (Direct and Indirect) Legal & General Investment Management Limited (Indirect) (LGIM)

Legal & General Group plc (Direct) (L&G) (6,752,034 - 3.49% = LGAS, LGPL & PMC)

Legal & General Investment Management (Holdings) Legal & General Insurance Limited (Direct) (LGIMHD) (5,827,448 - 3.01% = Holdings Limited (Direct) PMC)

(LGIH)

Legal & General Assurance (Pensions Management) Legal & General Assurance Limited (PMC) (5,827,448 - 3.01% = PMC)

Society Limited (LGAS & LGPL) Legal & General Pensions Limited (Direct) (LGPL) Proxy Voting: 10. Name of the proxy holder: N/A

11. Number of voting rights proxy holder will cease to hold:

N/A

12. Date on which proxy holder will cease to hold voting rights:

N/A 13. Additional information:

Notification using the voting rights figure of 193,410,140

First notification under DTR Sourcebook

14. Contact name:

RACHEL FELL, DEPUTY SECRETARY, COOKSON GROUP PLC

15. Contact telephone number:

020 7822 0000

COOKSON GROUP PLC

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Related Shares:

Vesuvius